4. Explore the feasibility of ARemind through a third user study: An intervention module with an analytics engine will be built. It will personalize reminder messages based on adherence levels and facilitate patient phone calls with social workers/adherence counselors when appropriate. A clinic appointment reminder module will be created and interfaced with the health information exchange of Boston Medical Center (BMC). A new version of ARemind (version 3.0) will contain these new modules and content improved based upon the second study. ARemind 3.0 will be tested through a 24-week longitudinal study of 70 patients. Thirty five patients will be randomized to use cell phones with ARemind 3.0 (intervention) while 35 patients will use beepers (control). Patients will use MEMS caps for composite adherence scores that will be done at each of their 9 adherence visits during the study. Analysis of feasibility, efficacy, user-fatigue and cost-savings from improved adherence to medications and clinic appointments will be performed in this aim.